MB has specfic test parameters for performance, but you can always test at max load - doors open fan on highest speed.The oil overcharge looks like a parabolic curve. And, unfortunately a small high side pressure gauge on a short hose. Besides, you have a greaseisel. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. I would not do a 134a conversion without a PF condensor. bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. Look at where the lines will end up. Its chemical symbol is CCl2F2. a 50f delta across the condensor is good, but I suspect that is an idle reading. Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. J.Harris said: Or if you want to do it like they do in Mexico you can use propane, it's an excellent refrigerant but highly flammable. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. The Wikipedia explanation for expansions valves cited in Frank's thread says that the gas inside the bulb in the metering valve is the same as the refrigerant in the system. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. First, differences in physical properties: 1, insoluble R12 compressor oil is used (to reduce the lubricant) 2, dissolved sealing materials are used (resulting in refrigerant leakage) 3, easy to damp (so easy to internal . difference between r12 and r134a expansion valve By after changing just about everything, he got what was termed, satisfactory cooling. Maybe a jerky locker.I cleaned the condensor with the off the shelf ac cleaner stuff from Home Depot that I used on my home evaporator. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. Shorting the plug for the refrigerant switch should run the fan when the compressor is on. Sense ells no existirem. The non-flammables can have R22 type gas which is not compatible with most rubber hoses or they have gases that contribute to global warming. I'm thinking I might have put too much oil in the system - everywhere i read had a different amount - the manufacturer of the compressor, the MB factory service manual, online forums. 42 (at best) w/ 134A in 2000 isuzu trooper. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. The Wikipedia explanation for expansions valves cited in Frank's thread says that the gas inside the bulb in the metering valve is the same as the refrigerant in the system. Here are the basics for converting a system that does not have a charge of R12, its empty. Generally you follow the refrigerant flow moving from connection to connection, component to component, and you sniff the a/c vents to check for evaporator leaks as well. = R134a Charge Level. and an evaporator core and expansion valve that are optimized for R134a . leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . And by matching the correct amount of R134a to use in a given vehicle, correcting the superheat of the expansion valve (if necessary), you can in some manner nearly balance or match the amount of heat drawn out by the evaporator and released by the condenser. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. gital control scheme. R134a refrigerant fittings are different size. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. 2022 nba 2k22 starting a fashion label signing the designer, a difference between r12 and r134a expansion valve, 2020 white paper of the church of pentecost, Chime Mobile Check Deposit Funds Availability, Why Does James Kill Donald In The Vanishing, nba 2k22 starting a fashion label signing the designer. R12 is simply too expensive for a 25+ year old A/C system. The best replacement for R134a is R1234yf, while R12 refrigerant replacement was R134a. Compressor. Thus, when the system is running, condensing the CO2 is not a problem. The approval is very legal one, governed by the U.S. EPA. Not going to mess up your 'do, but you can feel it. -------------------------"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." Replace the drier with a drier that has a desiccant that is R134a compatible, use new R134a o-rings. R134a is NOT less efficient than R12 Actually R134a is more efficient. You may be just fine on oil - it depends on what compressor you have & how much oil you put in.A T/C is short for Thermocouple. Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy. How is the vent airflow?I would jumper the aux fan & check the performance. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. Big . Please enter the name by which you would like to log-in and be known on this site. However, it was found to be a very bad gas for the environment. The aux fan didn't switch on though and I didn't check the high side temperature. Recharge the compressor with a/c ester oil and a tracer dye. The only difference I can imagine would be the recharge connection. Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . If you you dont have the free time to play then you are better off to pay a technician. If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? Therefore, the R12 refrigerant is illegal, and emitting it is illegal. R12 is highly destructive to the earths ozone layer. Rules governing changing from the former to the latter differ between countries. A/C Expansion Valve Replacement Cost. Pray I can let some oil out of the compressor without losing my precious R12. _____ 2012 E350 2006 Callaway SC560 . How is 1234yf different from . . When I compare parts, 93 uses one part number and 94 has a different part number. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. Hence, let us continue to fix it. (You must log in or sign up to reply here. This leads me to labor over every small decision. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% . But R22 is almost equally damaging. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. 2001-2023 Griffiths Technical Inc. All Rights Reserved. The expansion valve(Tx) is in the car at the inlet line to the evaporator with compressors you best get advice from an ac specialist shop as the differences could be the gas that it pumps some systems use R12 and others use R134a or later gas yes R1234yf Freon gas can be replaced by R134a; the newer systems were designed with this in mind so no, there will be no damage to the compressor but some time in . Autor de l'entrada Per ; Data de l'entrada calexico west port of entry hours; 12 month libor rate 2021 a difference between r12 and r134a expansion valve a difference between r12 and r134a expansion valve The crossover point is approximately at 64F. The condenser water inlet temperature and flow rate are controlled with the use of a . 34 in 70 series w/ R12 in 100+ Tucson, AZ summer heat w/ hd-t, w/ 13B-T is was unbearable about 31 at vent w/ R12. ). Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. If you have the work done, be sure you find a true "A/C" shop that can make up lines. By using a qualified a/c shop with the proper equipment you odds are in your favor of having the job done correctly the first time. Your old hoses of course will not fit. Don't like the sound of custom parallel condensor. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Theres no doubt that R12 refrigerant is one of the first compounds manufactured for the air conditioning and refrigeration world, but it had to be banned. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. R134a is called tetrafluoroethane (HFC). You will be fine with a 134a-compatible TXV running R12. By using a black light the dye will glow in areas where oil leaks are visible. Bohica, I appreciate your help with this. I could easily be over at least 2 - 3 ounces over on the oil. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. PDF Experimental analysis of Thermostatic expansion valve, Constant The sticker typically has a place to note the amount of refrigerant used, the type of oil and amount of oil, the technicians sign off or name and the date of the conversion. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. Welcome to rxmechanic.com. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. The chemical composition of R12 and R134a differ. The system has been previously converted to R-134a. Is there a source of valves by, say, eaton number? You may need to adjust the valve in a bit to get desired superheat. The value of carbon dioxide is 1. R134a refrigerant is about 10% less efficient in moving heat than R12! link to How to cut off a Catalytic Converter. Tamb oferim en VOSC el contingut daquestes sries que no es troba doblat, com les temporades deDoctor Who de la 7 en endavant,les OVA i els especials de One Piece i molt ms. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. Air Conditioning Expansion Valve R134a - R12 replacement kit #4. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. So the steps involved are cleaning out the old oil, replacing all the O-rings, replacing the dryer, replacing the expansion valve, and converting the high and low side connectors from Schrader to quick connect valves. Just leave it alone for now. I found that in the..Maxposition on the control it will have the compressor running all the time. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. There are R134a specific valves that operate at a slightly different pressure, but not for any "old" automotive application that I'm aware of. Make sure to get the R12 EXP valve if that is the way you go. R12 and R22 are both now banned by the EPA in the United States. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? R134a has the chemical formula CF3CH2F and is known as tetrafluoroethane. Table 1 summarizes the technical characteristics of three potential R134a alternatives. In this study, without the need for major modifications to the bus air conditioner, the variation of the ejector dimensions according to different parameters has been investigated in the case of using the R1234yf, R1234ze(E), or R600a refrigerants, which may be a substitute for R134a as a refrigerant due to . Can I use the one for the R-12? |. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. The pressure at low temperatures is nearly the same between 12 and 134a. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. Compared with the cost-performance ratio, R507 is 30-40% . I'll put the relay on for that. . In sum, R12 has done more bad than good. I am ordering new parts, and planning to convert my system to R-134a. If the system was upgraded by a professional it should have an upgrade sticker. It's helluva humid and hot here in north florida, and I drive around all day for my job. Existing technology: R134a has been in use in the refrigeration industry for very many years, and theres so much information about the safe use of the product. 4) Repeat step 2, making sure it will fit. Any suggestions, or do you need to know the hi/lo readings? R134a vs. R12 - Griffiths I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . Dimensioning of refrigeration components - part 2 - Danfoss R12, on the other hand, is called chlorofluorocarbon (CFC). To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. They would then make short "jumper hoses" to connect to the existing stock hoses, refit your old fan if there is a "pusher" fan, and recharge to specs. Hmmmm. of refrigerant insulation tape. Performance doesn't seem to have improved. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . Participate in over 40 different forums and search/browse from nearly 3 million posts. The #1 question asked by NEW MEMBERS. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. I don't want to be chasing ghosts. Also the new quick connect fittings for the high & low side. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. Yes, the 50F diff (160-110F) on the condenser was at idle, and ambient was about 90F. . ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. These cheap kits usually have a few cans of R134a (either 12 ounce or 16 ounce), maybe an extra can of refrigerant oil, a few generic R134a charge port adapters and maybe some o-rings. For those of you who are considering what the cost is for R12 you can think of it this way: Dont go out to dinner this weekend. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Since then, the industry standard has been R134a, which is an efficient replacement. So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. 5) A/C System Failure. It is a known suspect that lets heat into the heat exchanger/core even when off because the mono-valve is on the exit side of the heater core. Expansion Valves Catalog E-1, July 2012. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. A York oil capacity is listed as "6.5 to 9.6 ounces". According to Wikipedia, There is such a thing as "r132a" (1,1-Dichloro-2,2-Difluoroethane), however there is no indication of it being a commercially produced refrigerant. A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues. One of the differences between auto air conditioners that have been redesigned from R12 to R134a is that the condensers have gone from serpentine to pseudo-parallel. The global warming potential measures the amount of heat trapped by any gas compared to the amount of heat trapped by the same amount of carbon dioxide. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. That switch should close @ 52c. difference between r12 and r134a expansion valve Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. Stability: RR12 doesnt disintegrate even under extreme operating conditions. Can I use the one for the R-12? Have a look in the FAQ Section, and look for "Fan clutches & testing them". 3) A TXV optimized for 134a will be ok with R12. How an A/C Expansion Valve Works. difference between r12 and r134a expansion valve. For example, at an evap temp of 30 (your daughter's system is probably running around 25-28 saturated in order to give a 32 duct temp), the pressure of R-134a is 26.1psi. With the oil leaking out and being told all sorts of things about how these compressors don't have a sump etc, I wanted to be on the safe side. Then again, there are two different expansion valves. Electric fans do wear out. The car never overheats, if that has any import. Kommentare . Also called the orifice tube. This refers to BTU's (heat) moved per pound of refrigerant moved. Swapping the components isnt a herculean task, but recharging the AC is a challenge. The cure is to use the newer R134a compressors is sealing washers that are different thickness. Blows pretty hard on full. We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. It is made up of carbon, hydrogen, and fluorine. This can be very very expensive. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. Is there more info needed?THanks -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Paul:I had to dig a bit deeper - MB made several running changes in the 1983 123'sThere are actually 4 different circuit diagrams for the A/C system that year - just for your 123.123 I found the R4 reference, and it should have 170 Ml of oil in the system.Your aux fan should run at the ambients you listed. Expansion Valve. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. Generally this works well for the whole system. I'm doing one thing at a time so I know what the cause was. You can also check the Aux fan in your case. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Superheat you can consider to be the additional amount of heat. In practice this means that the car can overheat and the aux fan will stay off! How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? difference between r12 and r134a expansion valve Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. . Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. Unfortunately, the R12 refrigerant doesnt always blow cold air. difference between r12 and r134a expansion valve . Most of all the differences gravitate to longevity, functionality, and safety. But I've read that these car's didn't do too well in the a/c stakes, so that might just be as good as it gets. But R22 is almost equally damaging. A vacuum pump, a refrigerant recover system, quality service gauge set with both low and high side gagues, and much more besides the lessons to learn what to do and what not to do. A/C receiver difference between R12 and R134a? Quick View. It cycles on off in med (or low for that matter)Gotta tell ya. Poc temps desprs van decidir unir els dos webs sota el nom de Xarxa Catal, el conjunt de pgines que oferirien de franc sries doblades i/o subtitulades en catal. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. The analysis focuses on Coefficient of Performance for . AC R12 to R134A Conversion | MR2 Owners Club Forum Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . Do a pre-inspection and then Evacuate (vacuum down) the system, the longer the evacuation the better but there is a point of diminishing return, 2-3 hours is generally very good. Is the information not applicable to the old Pantera system? The oil used in R12 and R134a are different and not compatible. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. The ozone depletion potential of a chemical is a factor that shows the level of degradation itll cause to the ozone layer that surrounds and secures the earth from harmful radiation. Unfortunately, the oil only mixes with the refrigerant as a liquid. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). I'll report back on the aux fan on performance next. They plug all the time. video clubhouse baseball; nick fairley draft profile; ben davis work pants difference between r12 and r134a expansion valve Then when it is switched off for a few minutes and then back on, the air cools again. Production of R12 ceased in 1996, although it can still be reclaimed, purified, and resold, and small cans of New Old Stock R12 are still widely available on eBay and Craigslist. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. Safety: R134a is safe to use as its non-flammable and cant explode. And I lied about the compressor switches on this car - there are 2 switches on the drier - a temp and a pressure switch.

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